Live startup fails: taskDrive is assigned without Cordis provide #1120

Written-by: Dev

Environment

Real dsh web host with plugin ds-bot = FlyBot core at a188fa2 (#1115, which closed #1109).

Steps to reproduce

1. Start dsh web with the FlyBot core plugin at a188fa2.
2. Wait for the Main Bot setup.

Actual

Startup throws before any Bot loads:

bot (ds-bot): Error: cannot set property "taskDrive" without provide
    at Module.install (.../core/src/host/task-drive.js:224)
    at createRuntime (.../core/index.js:95)

The UI stays on "Setting up your Main Bot…". core/test/task-drive.test.js still passes because the test context allows a plain assignment.

Expected

The host finishes activating. taskDrive is registered with Cordis provide (the same path as flybot: ctx.provide, then ctx.reflect.provide, then ctx.set, then a plain property). Tests can still read ctx.taskDrive.settled(), .consider(), and set .now.

Where it sits

core/src/host/task-drive.js ends with ctx.taskDrive = { now, settled, consider }. Cordis 4's context proxy throws on that write once the plugin fiber is active. provideFlyBot in core/index.js already handles this for flybot.

Suggested direction

Register the handle with provide instead of removing the test API.

Claim: branch cursor/task-drive-provide-deab. This unblocks live use of #1115 / #1109.